tpm: change 'tpm_suspend_pcr' to be module parameter

Fix the following warning:

drivers/char/tpm/tpm.c:1085: warning: `tpm_suspend_setup' defined but not used

and make the workaround operable in case when TPM is compiled as a module.
As a side-effect the option will be called tpm.suspend_pcr.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Cc: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Cc: David Safford <safford@watson.ibm.com>
Cc: James Morris <jmorris@namei.org>
Cc: Debora Velarde <debora@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Morris <jmorris@namei.org>